Aligned the table header fields with the table columns in the doc history page. Marked the action text safe so as to make embedded links show up as links.

- Legacy-Id: 9585

ietf/templates/doc/document_history.html

@@ -91,8 +91,9 @@
   <table class="table table-condensed table-striped ietf">
     <thead>
       <tr>
+	<th></th>
         <th>Date</th>
-        <th>Version</th>
+        <th>Rev.</th>
         <th>By</th>
         <th>Action</th>
       </tr>
@@ -102,9 +103,9 @@
       {% for e in events %}
         <tr class="anchor-target" id="history-{{ e.pk }}">
           <td class="text-nowrap">{{ e.time|date:"Y-m-d" }}</td>
-          <td class="text-right">{{ e.rev }}</td>
+          <td class="text-center">{{ e.rev }}</td>
           <td>{{ e.by|escape }}</td>
-          <td>{{ e.desc|format_history_text }}</td>
+          <td>{{ e.desc|format_history_text|safe }}</td>
         </tr>
       {% endfor %}
     </tbody>